The average of 6 numbers is 19. When one of those numbers is removed,

The average of 6 numbers is 19. When one of those numbers is removed, the average of the remaining 5 numbers is 21. What number was taken away? (A) 2 (B) 8 (C) 9 (D) 11 (E) 20

https://gmatclub.com/forum/the-average-of-6-numbers-is-19-when-one-of-those-numbers-is-removed-317687.html